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"canine" is also used as a crossword clue. If that's what you saw, the answer is often dog (3 letters).
Definitions
any of various fissiped mammals with nonretractile claws and typically long muzzles
Word origin
From Latin canīnus (“of dogs, doglike, dogtooth”), from canis (“dog”). Compare French canin.
Used in a sentence
“Two canine animals in a time of dearth, may be truly said to struggle with each other which shall get food and live.”
“We carried the dog round to the yard, and I examined his head. […] I accepted the care of the canine patient.”
“A lost dog sniffed around the flower beds wishing it had some canine company[…]”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Dog tooth”6 letters
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